Anatole eheet



lI/llllll lll/ ' Patented July 121881.

(No Model.)

A. EHRET.

, ROTARY VALVE.

INVEN':

WWWLVL er Washmglnn n c \& WITNEE SEE UNITED STATES PATENT OFFICE.

ANATOLE EHRET, oF 'wEsr BERKELEY, AssreNoR 0F ONE-HALF T0 FRANK x. GIGOTT, 0F sAN FRANCISCO, CALIFORNIA.

ROTARY SVQALVE.

SPECIFICATION forming part of Letters Patent No. 244,208, dated July 12, 1881.

Application filed April 15, 1881. (No model.)

To all whom it may concern:

Be it known that I, ANA'roLE EHRET, a citizen of the United States, and residing at West Berkeley, in the count-y of Alameda and State of California, have invented a certain new and useful Improvement in Steam Engines, of which the following is a specification.

My present invention is intended as an improvement upon steam-engines for which Letters Patent of the United States were granted to me November 4, A. D. 1879, No. 221,224; and it consists in the novel construction and mode of operatinga rotary reciprocating valve to control the induction and eduction ports of a steam-engine, as will hereinafter be more fully described.

In the accompanying drawings, in which similar letters of reference are used to designate like parts throughout the several views, Figure 1 is a longitudinal section through the steam-chest and cylinder of a steam-engine on line X X of Fig. 2. Fig. 2 is a vertical crosssection through the steam chest and oscillating valve. Fig. 3 is a vertical cross-section, partly broken away, on line Y X of Fig. 2. Fig. 4 is a perspective view of the valve. Fig. 5 is a plan view of the valve-rod, showing the slot therein. Fig. 6 is a cross-section on line Z Z of Fig. 5.

A represents the cylinder, constructed with a double head and induction-passage B and eduction-passage O. The space between the two heads D and E forms the steam-chest, and also the seat for the oscillating valve F. The inner head, D, is constructed with ports G H and induction and eduction passages or pipes B O. The heads of thecylinder are to be provided with :stuffing-boxes, constructed in the usual manner, through which plays the valvestem or piston-rod K. r

The oscillating valve F is provided on its upper surface or face with a recess, M, which is of sufficient length to overlap either of the induction-ports and the exhaust-aperture O.

The reciprocating valve-stem or piston-rod K has keyed upon it the piston-head N, and is provided with a groove or slot, 0, formed longitudinally in the rod along its length, and the opposite sides of this slot are curved at their opposite ends for a distance, say, of onethird or one-fourth of its length, while the remaining portions of the sides are straight, as is seen in Fig. 5, and these curved portions of the slot are not on an axial line with each other, as shown in my patent above referred to, but are inclined in opposite directions. As the valve-rod K passes back and forth through the cylinder and steam-chest the curved sides R 1% of the groove therein cause a partial rotation or an .oscillation of the valve F from right to left, and vice versa, by acting upon a stud, P, fixed within the central aperture, Q, of the said valve F, while the straight portions S S of the groove hold the valve stationary at the end of each stroke of the piston, to bring one of the steam-ports G and H alternately into communication with the exhaust pipe or passage 0, and to open the other port for the passage of steam from the st eam-chest T,which receives it through the inlet B, and herein my present invention differs from that described in my former Letters Patent, as the feather to produce the straight grooves in the rod therein described is in my present invention omitted altogether.

In operation the valve F occupies two different positions during the reciprocation of the rod K-one when the recess M opens the passage for the exhaust-steam from the port Gto the eduction-passage O, and the port His open for the *passage of steam into the cylinder, and the other when it opens the passage for the exhaust-steam from the port H and opens the passage for the live steam into the port G, each port serving alternately as a supply and exhaust passage for the steam from the steamchest and into the exhaust-pipe C.

The object of having the two straight sides S S of the groove 0 is that the rod may pass through the valve at the principal portion of each stroke without moving the valve.

Rotation of the valve takes place only when the curved portions It It of the groove come in Contact with the stud P of the valve.

By this construction of valve and the manner of operation it enables me to construct an engine at a very low cost of manufacture by reason of the great simplicity and reduction of the parts of the valve mechanism.

Having thus described my invention, what I claim, and desire to secure by Letters Patcut, is- V In combination with the induction and eduction passages in the cylinder-head of a steam- 5 engine, the rotary reciprocating valve-stem or piston-rod K, provided with a groove, 0, having straight sides S and curved ends R, and carrying an oscillating valve, F, provided upon its face with a recess, M, and having a stud,

10 P, within its central aperture adapted to engage with the grooved stem, substantially as and for the purpose shown and described.

In testimony that I claim the foregoing I have hereunto set my hand and seal this 26th day of March, 1881.

ANATOLE EHRET. LL. s.

Vitnesses:

O. W. M. SMITH, CHAS. E. KELLY. 

